Flaveria bidentis
Flaveria floridana
coastal plain yellowtops
Florida yellowtops
erect.
erect.
petiolate (proximal, petioles 3–15 mm) or sessile (distal);
blades lanceolate-elliptic, 50–120(–180) × 10–25(–70) mm, bases (distal) connate, margins serrate or spinulose serrate.
sessile;
blades usually linear or lanceolate, rarely subelliptic, 50–140 × 4–17 mm, bases ± connate, margins entire, minutely serrate, or spinulose-serrate.
oblong-angular, 5 mm.
suburceolate, oblong-angular, 3.6–4.5 mm.
0 or 1;
laminae pale yellow, ovate-oblique, to 1 mm (not or barely surpassing phyllaries).
0 or 1;
laminae yellow, ovate-spatulate, 2–2.8 × 1.5–2 mm.
(2–)3–8;
corolla tubes ca. 0.8 mm, throats funnelform, 0.8 mm.
9–14;
corolla tubes 0.8–1 mm, throats funnelform, 1.3–1.5 mm.
3(–4), oblong.
5–6(–9), oblong or ovate-orbiculate.
of 1–2 linear bractlets 1–2 mm.
of 1–3 linear-lanceolate bractlets 4–6 mm (often surpassing involucres).
20–100+ in tight subglomerules in scorpioid, cymiform arrays.
20–100+, in dense, scorpioid-cymiform arrays.
oblanceolate or subclavate, 2–2.5 mm (those of ray florets longer);
pappi 0.
oblong-oblanceolate or linear, 1.2–1.8 mm;
pappi 0.
= 36.
= 36.
Flaveria bidentis
Flaveria floridana
In the United States, Flaveria bidentis often occurs on ballast and waste ground near wharfs and the shore, locations that suggest its introduction from sailing vessels. The species is widespread and well established in South America, where it is thought to be native. Its floral structure appears to be the least advanced among the annual species of Flaveria, the heads being in somewhat scorpioid arrays. Distinguishing characteristics are 3(–4) phyllaries, 2–8 florets per head, reduced ray corollas, pubescent stems, and lanceolate-elliptic, bluish green, sometimes pubescent leaves. Flaveria bidentis is probably most closely related to F. campestris and F. trinervia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Flaveria floridana is known only from the lower Gulf coast of Florida; it is especially prevalent in the Tampa Bay area. The relatively long calyculus bractlets and modified peduncular leaves that extend beyond the heads distinguish it from F. linearis, the other perennial species in Florida. The closest relative of F. floridana is probably the similar F. brownii of the Texas Gulf coast.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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USDA Plants Database
